Telecommunication system



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aa/vu :Mura/ f GEPHLD DEHK/N BY /IL A Tra/M E y `Eatentec'i Fei). 27, 1951 UNITED STATES PATENT OFFICE TELECOMMUNICATION SYSTEM Geraid Deakin, New York, N. Y., assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Original application February 5, 1944, Serial No. 521,160. Divided and this application October 6, 1945, Serial No. 620,835

Claims. 1

` of my copending application Serial No. 521,160,

iiled February 5, 1944, now Patent No. 2,484,086, issued October 11, 1949.

According to the present invention, intraand inter-office switching is controlled by a register through the agency of any one of a plurality of stages oi group selectors. Tandem switching, for instance, may be controlled via any one of a plurality of levels of stages of selectors, including the iinal selector.

Another feature of the invention has to do with the conversion of the register controller from multi-potential to directive impulse control when a selector seizes the trunk leading to another exchange.

The invention also has to do with the control of out-trunking, with the adjustment of the register for mixing dialing, e. g. six and seven digits, and with other features which will more clearly appear from the following detailed description and the appended claims:

As much of a multi-office system will be described as is necessary for a clear understanding ci the invention. While a telephone system of the so-called multi-potential selection type will be disclosed, it will be clear to those skilled in the art that some of the features are applicable to many other types of switching systems, whether they are used for establishing telephone connections or for any other purposes.

Y In the drawings: V

Fig. l is a block diagram showing the general lay-out of the system;

Figs. 2a to 2f illustrate the various selector circuits;

Fig. 3 shows an all-purpose selector circuit which may be adjusted for various purposes in the manner indicated in Fig. 3a.;

Fig. 4 shows a subscribers line circuit;

Fig. 5, an R-link start and chooser circuit;

Fig. 6, an R-link;

Fig. 7, a B-link;

Fig. 3, the terminal bank oi a inal selector;

Fig. 9, an F-link;

Figs. 10, 10a and 10b, a register;

K Fig. 1l, a two-digit translator link;

Fig. 12, a two-digit translator bank;

Fig'. 13, a three-digit translator link;

Fig. 14, a three-digit translator bank;

Fig. 15, a false call trunk;

Fig. 16, a local trunk to a operator;

Fig. 1'7,`an out-trunk circuit;

Fig. 18, the tens position of a nal selector bank;

Fig. 19, a P. B. X trunk for in-dialing to a P. B. X; and

Fig. 20, a busy tone circuit.

The following are definitions of some of the expressions used in the specication and claims:

Multi-potential Working or operation means a selective operation in which a numerical or nonnumerical switch, such as a selector or line finder,

, numerical switch during its operation.

B-link designates a link extending between the wipers of a line finder and a first selector; R-link is a link by means of which a register may be associated with a B-link; T-link is a link by means of which an incoming trunk at an exchange is linked to the wipers of one of the Aug. l, 1944, and the patents and application re-w group selectors; TR-link is a link by means of which a register is connected to a T-link; A- register is a register controller by means of which the establishment of calls originating within the exchange is controlled; T-register is a register controller by means of which a call which originated outside of the exchange is controlled within the exchange in which the T-register is located; Final means the nal selector or connector by means of which the called line is seized.

For the sake of brevity, the words Contact and relay will not be repeated when :reference is made to the front or back contact of a relay. Thus back BER means the back contact of relay BER.

GENERAL The selection circuit The switching mechanism is a high speed, tube controlled, four brush selector adapted to hunt over a single unsplit bank of the type disclosed in Patent No. 2,336,471, issued Dec. 14, 1943, and Patent No. 2,330,812, issued October 5, 1943. The unsplit bank is made possible by the multi-potential selection arrangement here used and fully described in Patent No. 2,351,016, issued June 13, 1944; Patent No. 2,380,950, issued Aug. 7, 1945; the patent of H. F. Herbig, No. 2,354,682, issued lst line nder, Fig. 2c y r 2nd line finder, Fig. 2b, used with a B-link (Fig.

7) forms the usual connection 1st group selector, Fig. 2b, circuit Local group and penultimate selectors, Fig. 2a.

Final selector, Fig. 2d, used with F-linkv (Fig. 9)

Incoming trunk selector, Fig. 2e

Special service group selector, Fig. 2c

Tandem selector, Fig. 2e

` the calling subscriber without going to the trouble of tracing down the connection.

Register control 'with translation The system is register controlled. The register in the originating ofce-the so-called A-register-is connected to B-links (Fig. 1) through R-links. The R-links contain the equipment for handling the requirements of ringing, busy calls, metering, coin machines and other similar functions. For large areas where translation is necessary, translator links are associated with the register. Where mixed twoand three-digit ofce prexes are used, twoan`d-three'digit translators are also used. Each translator link has a register nder and translator nder. The banks of the translator nders are multipled, and one cross-connection for each ofce prefix suiices for all translators.

The trunks incoming from other offices (Fig. 1) terminate in groups of relays-designated as T-links-which are cross-connected to standard all purpose switching selector circuits.4 The registers which handle incoming calls-the so-called Y T-registers-are connected to the T-links through TR-links, corresponding to the R-links used with the A-registers. The possibility of cross-connecting and of using any group selector for local or incoming connections is a great convenience in a growing and changing network.

Adding translation to unsplit selector banks such as are used in the present system, greatly increases lthe eiiiciency of the trunk plan in large networks. Selections may be suppressed or bypassed, ior example, from the second group selectors to the penultimate selector for handling heavy local traffic. This is indicated by dotted lines in Fig. 1. Trunks may be routed in any convenient manner and not according to a fixed numerical designation as is necessary in systems without translation. Additional selections may be introduced to provide for large group concentrations for the more economical use of long and important loaded trunks, etc.

The translator controls the re-routilig of calls and is automatically connected with the register depending on the number' dialed. After it has performed its function, the translator is disconnected from the register.

Register relays (total 37) An explanation of the functions of the Various relays will be helpful in tracing the circuits of the register. The relays may be divided into the following four groups:

(a) REGISTER PROPER (18 RELAYS, FIGS. l0, 10a) DRL-'dialing relay. Follows dial impulses.

RlR-slow release relay. Does not fall on" during pulsing.

R2R-slow releasing change-over relay. Does not fall 01T during pulses but only when the circuit is opened between the dialing of digits when DR comes to rest on its front contact.

RAR-operates when the register is picked up and adapts the register to select the first line finder and the calling line.

RER-operates when the calling line is picked up by the rst line finder and releases RAR. RCR-multi-contact relay to provide ground holding contacts. Y

RDR-operates when the first pulse is received and transfers the grid of VIB from the calling line potential PC to the busy potential PB thus adapting the register to control the selectors.

RER-disconnects the identifyingY service class potential PS when dialing commences and in place thereof connects potential PJ to the grid of 'V IA.

RFR- low resistance relay in series with the a wire. Operates when the selector is hunting.

RGR-a slightly slow releasing relay. Operated by RFR and when operated, connects the grid of VIA to the PN or PT potential and, when on its back contact, to potential PJ. This relay always makes its back contacts before relay GSR! breaks its -front contacts.

RLR-operates when the units are being selected. Prepares register `for release or change to in-dialing to P. B. X.

RPR- operates when tens are being dialed to remove potential PB from the grid of VHB. XR-multi-contact relay. Restores digit switches to normal.

GVR-high speed relays. Operated by gas valves. Speed in breaking relatively heavy current at back contact essential requirement. Y

GSR-slow releasing relay. Operated by G-VR. Used to establish condition necessary for change-over from one selection to the next or for release.

HTBR-connects the high tension plate battery of volts to one electrode of the gas valves GVE and GVZ and to one'side of the windings of relays GVRi and GVRZ.

(b) TRANsLA'roR- UNIT (6 RELAYS, FIG, 10b) ETEA-connects two-'digit 'translator link :to register when any rstdigit 2 to 7 is dialed. RTRZ-connects three-digit translator link when two-digit translator link finds the rst two digits dialed from part of a three-digit oflice prefix.

RTRS-starts selectin when the translation is complete.

iRTR-reduces oflice prefix selection to three. 

